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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
12121600 ISSAQUAH CREEK NEAR MOUTH, NEAR ISSAQUAH, WA
LOCATION - Lat 47°33'09", long 122°02'48" referenced to North American Datum of 1927, in SE 1/4 NW 1/4 sec.21, T.24 N., R.6 E., King County, WA, Hydrologic Unit 17110012, on downstream side of S.E. 56th Street bridge, 0.7 mi downstream from North Fork, 1.2 mi upstream from mouth, 1.6 mi northwest of Issaquah, and at mile 24.1 (continuation of Sammamish River).
DRAINAGE AREA - 56.6 mi². includes 1.9 mi² of Cedar River drainage from upper Rock Creek, which normally is diverted into Issaquah Creek.
REVISIONS HISTORY - WDR WA-77-1: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - September 1963 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 35.99 ft above NGVD of 1929 (topographic map) and is 38.936 ft above NAVD of 1988 (GPS survey by USGS on June 16, 2022).
REMARKS - Many minor diversions for irrigation and domestic use upstream from station. Chemical analyses November 1964 to September 1971, October 1973 to September 1974. Water temperatures September 1970 to September 1971 and December 2006 to December 2007. U.S. Geological Survey satellite telemeter at station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 3,200 ft³/s, Jan. 9, 1990, gage height, 13.50 ft; minimum daily discharge, 11.0 ft³/s, several days in 2003-04.
WATER-QUALITY RECORDS
PERIOD OF RECORD - November 1964 to September 1976; May 2001 to October 2001; December 2006 to December 2007 (discontinued).
PERIOD OF DAILY RECORD - WATER TEMPERATURE: December 2006 to December 2007 (discontinued).
INSTRUMENTATION - Temperature recorder with one-hour logging interval.
REMARKS - Temperature record is rated good.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum recorded, 20.4°C, July 11, 2007; minimum recorded, 2.0°C, Jan. 14 and 15, 2007.
